Press for dental flasks



(No Model.)-

w S MIGNAULT PRESS FOR DENTAL FLASKS.

No.. 566,207. Paented Aug. 18, 1896.

j i l nventor.

K MYZZZKZ IJNTTED STATES PATENT OEErcE.

SAMUEL MIGNAULT, OF HOLYOKE, MASSACHUSETTS.

' PRESS FOR DENTAL FLASKS.

SPECIFICATION forming part of Letters Patent No. 566,207, dated August18, 1896. Application filed May 26, 1896. Serial No. 593,171. (Nomodel.)

To a whom zit may concern;

Be it known that I, SAMUEL MIGNAUL'I, a citizen of the United States,and a resident of Holyoke, in the county of Hampden and State ofMassachusetts, have invented certain new and useful Improvements inPresses for Dental Flasks; and I do hereby declare that the following isafull,clear, and exact description of the invention, which will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawing, which forms apart of this specification.

My invention relates to dental vulcanizing apparatus; and its object isto provide an improved press for holding the flasks or molds underpressure during the vulcanizing process, so that as the rubber or othermaterial melts therein it will be compressed, so as to give it theproper density and cause it to be uniformly vulcanized throughout themass. In the ordinary process for holding such flasks the pressure hasbeen produced by means of a screw or screws,which necessitates frequentattention in order to keep up the pressure. By my invention this isobviated, as the flasks are held in the press under spring-pressure,which will be continuous and uniform.

The invention consists, essentially, in a base upon which the flaskrests, two vertical rods secured thereto, connected together at theirupper ends by a cross-bar, a verticallymovable follower having anaperture or hole near each end,through which said rods loosely pass,coiled springs encircling said rods, with their ends confined betweensaid follower and cross-bar, and a central handle secured to the upperside of said follower, as will be hereinafter fully described andclaimed.

In the accompanying drawing the figure represents a perspective view ofa press constructed in accordance with my invention.

In the said drawing the reference-nun1eral 1 designates the base,preferably of metal and circular in form and formed with two lugs 2 nearthe edge or periphery, holding a flask in position when placed thereon.Secured to this base are two opposite vertical rods 3, connectedtogether at their upper ends by a crossbar 4-. These rods pass looselythrough apertures near the ends of a vertically-movable follower 5, andencircling the rods above said follower are coiled springs 6,the ends ofwhich are confined between the follower and crossbar and the tendency ofwhich is to press the follower downwardly. Secured centrally to saidfollower on the upper side is a rod 7, provided at the upper end with ahandle 8, by which the follower may be elevated.

I11 using the press the follower is elevated by means of the handle andone or more flasks placed underneath the same. The handle is then letgo, when the springs will press the follower down upon the flasks undera uniform continuous pressure, and as the rubber melts during thevulcanizing process it will be uniformly compressed in the flasks,requiring no attention until the vulcanization is completed.

When two or more flasks are inserted in the press, they are superimposedone above the other. When a single flask is placed therein, a block ofany suitable material may be interposed between the same and thefollower, so as to utilize the full pressure of the springs.

Having thus described my invention, what I claim is In a vulcanizing-press, the combination with the solid base having lugs 2, formed on itsupper surface, the vertical rods 3, secured to said base, and thecross-bar 4, secured to the upper ends of said bars, of the follower 5,having apertures near each end through which said rods loosely pass, therod 7, secured to said follower and provided with the lateral handle 8,and the coiled springs 6, encircling the upper ends of the rods 3, andconfined between the follower and the cross-bar 4, substantially asdescribed.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

SAMUEL MIGNAULT. \Vitnesses:

ARTHUR J. COMTAIS, LOUIS Oorrnux.

